switch from server_version to server_version_num #609

Job	Run time
sdist	11s
linux (x86_64)	51s
changes	3s
macos (x86_64)	24s
linux (x86)	1m 4s
linux (aarch64)	1m 15s
macos (aarch64)	18s
windows (x64)	2m 19s
linux (armv7)	1m 26s
windows (x86)	2m 20s
linux (s390x)	1m 11s
linux (ppc64le)	1m 12s
Build and push base pyrust	0s
Build and push base postgres image	0s
test	0s
	12m 34s

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